\chapter{Energy Management System}\label{energy-management-system}

The Energy Management System (EMS) feature in EnergyPlus is an advanced user feature that many users will not need (but may try anyway). Custom programming features are written in the EMS runtime language (Erl). Most of the features have been added to the modules as appropriate. Further ``actuators'' may need to be added (or desired to be added) and new component developers should review the following information and determine if actuators are useful for the component.
